Mercedes-Benz
S430
92

Airmatic Pump Motor May Fail Due to Sticking Relay on Mercedes-Benz S430

Problem Description and Possible Solution

The relay which turns the airmatic suspension pump on may fail causing the pump to run continuously. This can result in failure of the pump motor or a dead battery as the pump motor will continue to run after the car is turned off. Also, Worn airmatic pump mount bushings can causes noises in the front axle while driving on bumpy roads or a buzzing noise while the pump is running.

Problem Data
RepairPal Verified
Average mileage: 118,813 (11,200–245,000)
7 model years affected: 2000, 2001, 2002, 2003, more2004, 2005, 2006
92 people reported this problem
Comments
Viewing 1 - 20 of 46 comments
my car is sitting on my tires i was driving then the whole car just sat low on the tires i guess the airmatic pump gone or the relay how much will this cost me aprox.
On my car the pump continuously running, then a started the car again I heard a clunk and the pump stopped. I drove it several miles to my next destination when I started the car again it did not raise up the instrument panel stated to stop driving car is to low get service.
The AirMatic Relay and 40amp fuse are within the fuse box under the hood on the passenger side. The AirMatic pump is inside the right front fender. Remove the rubber shield on the passenger side just behind the bumper. The AirMatic pump (about $350) can be seen. Very easy fix. R/R mounting bolts and buy a new 1/2 inch air inlet hose from AutoZone ($3.00). You can replace the pump in less than an hour.
The car lowered and will not rise up
air pump turn on but wii not raise the car rear
I don't have power on air suspension compressor
During two years of ownership, the airmatic suspension on my s430 have frequently released air when first starting or cornering, it sounds similar to the sound of air releasing from the air brakes on a bus. The noise was easy to tolerate, so we always sloughed it off, and considered our car as kind of a 'gassy girl."

Last night, after starting the car up, the noise became more pronounced, more gastrointestinal and guttural. After driving approximately 50 miles, there are no more sounds but the left side of the car is unusually low, so we are opting to have it repaired by our trusty Euro service team.
Vibrating noise on front end that makes the drive very uncomfortable. It makes you hate such a lovely car.
The pump continued to run after car was shut off, causing the battery to run down. Using Alldata as a reference, I unplugged the air pump to keep from running the battery down. Relay N10/1KR controls the air pump. I have yet to find the location to that relay. Alldata does not give that information.
replaced automatic pump and now while driving the pumps comes on too often. Is there any fix for this
Normal driving at 40MPH, came to a stop and felt a drop in the car, but no noise so continued to drive and the dash light came on with the message AIrmatic service get service.
occasional rumbling sound under the car just forward of the passenger side firewall right after startup and car completes rising at front end. Also hear a bumping sound like worn shock when going over speed bumps even at very slow speeds.
The car sits very low went to dealer cost fortune
Air pump and relay failed.
Everytime i hit a bump on roll over something i would hear a air seeping noise got the problem diagnosed leaking air bags and air control valve
Shut engine off and some motor keeps running - not the fan motor. I think it is the air shock motor. I disconnected the battery to keep from running the battery down. Don't know how to fix this"relay" assuming that is the problem.
Car is sitting on right front tire. Warning light came on "AirMatic Stop, Car Too Low.
I'm having the same problem.
2003 S430 Airmatic- car to low too low to drive
airmatic motor and sticks went out